Mold for making glass insulators



2 Sheets-Sheet 1'.

(No Model.)

s. OAKMA-N. MOLD FOR MAKING GLASS INSULATORS. No. 304,748.

Patented Sept. 9, 1884.

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SAMUEL OAKMAN, OF MELROSE, MASSACHUSETTS.

MOLD FOR MAKING GLASS INSULATORS.

LLPECIPICATION forming part of Letters Patent No. 304,748, datedSeptember 9, 1884.

7 Application filed May 31, 1884. No model.)

point that it will make a full screw and be -collapsible,so that thepoint may be withdrawn without turning it.

I attain these objects by the mechanism illustrated in the accompanyingdrawings, in which Figure 1 is an elevation of my invention. Fig. 2 is avertical section of the same, taken on line of Fig. 1. Fig. 3 shows aninsulator with a part of the core in place, the central wedge and theside segments being with drawn, as shown above. Fig. 4 is a section ofan insulator withthe hinged part of the core collapsed ready forwithdrawal. Fig. 5 is a cross-section taken on line :0 x of Fig. 1.

In the drawings, A, Figs. 1, 2, and 3, represents the body of the point,B being a screw which serves to connect the point to the press. Attachedto the lower part of this body A are a pair of hinged screw-pieces, D'D,Figs. 1, 3, 4, and 5, hinged at D, as shown at Figs. 1,

2, 8, and 4.. These pieces are connected to the rod 0 at their upperends by springs O 0, Figs. 1 and 3. These hinged screw-pieces D D aresupplemented by side pieces, E E, Figs. 2 and 5. In this connection itmay be well to state that the section shown in Fig. 2 is made at rightangles to the plane of view of Fig. 1.

F is a wedge-shaped piece connected to the rod G, by which said rod maybe withdrawn sufficiently to allow the pieces E E to collapse so muchthat the lands of the thread of the point may clear the threads formedin the in- E Fi 2. a a

sulator. XVhen this takes place, a continued upward motion of the rod Gwill withdraw the side pieces, E E, of Fig. 2 entirely from theinsulator, as shown in Fig. 3, leaving the hinged screw parts in theinsulator, as shown in said Fig. 3. Then the operator will collapse theparts D D, as shown in Fig. 4, and withdraw them, leaving the insulatorcomplete.

O 0, Figs. 1 and 3, are spring-catches, which have V-shaped terminationsO C so arranged as to readily engage with the holes D D, Figs. 1 and 3,in the hinged screwpieces D D. This device serves to hold the hingedpieces D D in position, as shown in Fig. 1, and thus keep thescrew-point intact the center being withdrawn without withdrawing thehinged pieces D D, as the resistance of the glass will hold these hingedpieces sufficiently to cause the Vshaped part 0 C of the spring 0 C toslip out of contact. The side screw-pieces, E E, are attached to thelower part of the bodyA by means of pins E These pins are rigidlyattached to the body A, but loosely fit the recesses in the parts E E.

I claimwhen it is out of the insulator, but admits of 60 1. In aninsulator-mold, the combination of the hinged screw-pieces D D, and sidepieces, E E, with the wedge-piece F, .all operating togethersubstantially as described, and for the purpose set forth.

2. In an insulator-mold, the combination of the hinged screw-pieces D Dwith the springcatches O G and the rod 0, all operating togethersubstantially as described, and for the purpose set forth.

SAMUEL OAKM AN. lVitnesses:

FRANK G. PARKER, HELEN M. FEEGAN.

